Method and mechanism for producing corrugated materials



H. B. SMITH METHOD AND MECHANISM FOR PEODUCING CORRUGATED MATERIALS wl.. mam m w Nn mf m d w n mm TA i Hw Dec. 7 ,I 926 H. B. SMITH METHODAND MECHANISM FOR PRODUCING CORRUGATED MATERIALS 1923 2 Sheets-Sheet 2Filed Sept. 13

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Patented vDec. 7, 1926.

UNITED STATES HARRY BRIDGMAN SMITH, OF BROOKLYN, NEW YORK, A ssiGNoR- ToBRIDGMANv SMITH PATENTS COMPANY, INC., or RRooxLYN, NEW YORK, ACORPORATION OF NEW YORK.

METHOD AND MECHANISM FOR PRODUCING CORRUGATED MATERIALS.

Application filed September My invention relates to the art of producingcorrugated sheet material such as corrugated paper or pasteboard, withor without a facing, including production methods and machines operatingin accordance with the methods. j

The general object of the invention is to simplify and improve mechanismand methods which have heretofore been used for producing corrugatedsheet material, and particularly to eliminate difficulties heretoforeencountered in threading, or passing the free end of the web through thecorrugating devices at the beginning of operations or whenever the webis broken or a new roll has to he inserted: to produce transversecorrugations of desired form and depth and to maintain the corrugationsin the desired form while the, web is subjected to a plurality ofpressing operations and also while it is carried through a relativelylong course in contact` with corrugating cylinders, and, desirably,while it is carried still farther under such satisfactory control thatthe corrugations are not permitted to lose their shape. to a point wherethe completed material is properly disposed of; to lproperly direct theweb from one corrugating roll to another and to a plurality of pressingpoints between different rolls while maintaining the web in closecontact with the corrugations of the successive rolls and preferably .tomaintain this contact throughout a large part or more than half of eachroll circumferences; and to effectively and properly strip thecorrugated web from each corrugating roll, this stripping operation withrespect to all except the. last roll of the series usually beingconcurrent with the application to and guidance of the web about thenext successive roll in the series.

A further object is to provide an improved method and means forapplyinga facing sheet to the corrugatedfweb in such a way that there isno tendency for the ribs of the corrugated sheet to become deformedprior to, during, or after application of the facing sheet, and to applythe necessary adhesive for securing the facing web in a new and improvedmanner.

13, 1923. Serial N0. 662,485.

A still further object is tov provide a new and improved method andmeans for winding the completed web of corrugated mateu rial in rolls.

In accordance with methods and mechanisms heretofore suggested and usedfor producing transversely corrugated webs of sheet material, such ascardboard, the corrugations have usually been produced either bycooperating members of articulated traveling belts, the corrugationsbeing produced by interfitting members of the belts and the web beingcarried through a fairly long course between parallel stretches of thebelts; or the corrugations have been produced by -ribbed rollers. In thefirst case the articulated belt-s or like devices are unduly complicatedand expensive, and more or less uncertain and slow in operation7 it isalso relatively difficult to properly heat the pressing elements, andother objections and difficulties are also involved, as sufficientlyunderstood by ypersons familiar with these mechanisms. In the secondcase, owing to failure to provide suitable web-guiding, stripping andcontrolling devices, it has been found difficult and practicallyimpossible toconvey the web through a sufficient-ly long course incontact with corrugating roll surfaces to produce t-he desiredcorrugated formation; and in fact in practical machines known to me thenumber of corrugating rolls acting on any web of material tobecorrugated is not greater than three, and the web actually passes aboutportions of no more than two of the rolls. In other machines proposedand used, the web passes around a portion of only a single roll and issubject to corrugating pressure between only one pair of cooperatingrolls. These constructions or arrangements are largely due to the use offixed guide or guard plates partly or entirely overlying the websurfaces as they pass about the corrugating rolls, and the employment offixed strippers, and the difiiculty experienced' in threading the webbetween the rolls and the guides and strippers, thisdiflicult-yincreasing with the number of rolls, which is therefore practicallylimited as above stated, in spite of the suggested, but ysuch belts orequivalent devices so far as I am aware have only been` used to stripthe web from a single roll or to direct it from a single point of rollcontact, and not to guide the web around any corrugating roll or toguide and properly retain it in contact with corrugating surfaces in acircuitous course about a plurality of corrugating rolls, or to divertit from one roll to another while maintaining the proper corrugatedformation.

In certain corrugating machines in which a facing sheet is applied tothe corrugated web, the latter is permitted to travel freely after itleaves the corrugating rolls and before the fac-ing is applied, andduring this free travel the corrugations stretch more or less in thelongitudinal direction of the web and thus become shallow, or in otherways lose their proper form. It is customary in certain machines toapply glue, for securing the facing web, to the crests of the ribs ofthe corrugated web. This involves certain difficulties, including thenecessity for exposing one face of the corrugated web to the glueapplying device and consequently losing proper control of the web atthat point. In other machines glue is applied to the facing web; but inr these cases, so far as I am aware, glue is applied all over thefacing, wi-th the corresponding unnecessary increase in cost ofadhesive, since in most cases the coating on the parts of the facingsheet intermediate the ribs of the corrugated web, is superfluous.

Diiculty has also been experienced in machines of this class in windingthe completed web of corrugated material in roll form, due to the factthat the completed roll has usually been driven from its center or fromthe shaft on which it was wound, and this involves a friction drive orother variable-speed drive, with accompanying complications anddifficulties, because of the constantly varying diameter of the roll andthe consequent rnecessity for driving it at constantly varying surfacespeeds.

To avoid the above lmentioned and other difficulties and disadvantagesof existing structures and methods, and to realize the above stated andother objects, my invention, as briefiy described, provides for passinga web of suitable sheet material such as cardboard, around a pluralityof corrugating rolls'and usually around large peripheral portions ofthree or more rolls, subjecting the web to corrugating pressure betweenadjacent rolls at a plurality of points and preferably at three or morepoints, and effectively directingn guiding and retaining the web inproper contact with the corrugated surfaces, positively maintaining. itscorrugated formation throughout its course of travel by continuoustraveling bands or belts which not only guide and retain the web in thestated manner but also act as traveling strippers and guides to stripthe4 web from each-roll and deliver or apply it to the next one whilemaintaining the corrugated formation and proper contact with the rollsurfaces; and the traveling belts or `bands are further, desirablyarranged to strip the web from the final corrugating roll and maintainthe corrugated formation during a further course of travel `to a point of utilization or disposal, such as the point where the corrugated web iswound in roll form.

The invention also provides, in cases where a facing sheet is desired,for advancing a strip of suitable facing material, usually paper, from aroll and applying it to the corrugated web while the latter is stillunder positive control to maintain its proper corrugated formation, andpreferably applying the facing strip to the corrugated web before thelatter leaves the last corrugating roll, and maintaining the web andfacing strip in Contact between traveling guides or controlling devicesthrough a course of substantial length and thus maintaining the propel'ribbed formation of the corrugated web until adhesive applied to securethe facing strip can properly set and permanently secure thecorrugations; and thereupon the faced web may be disposed of by cuttingit intolengths, or rolling it, or otherwise.

The invention further provides for applyinfrr adhesive to a surface ofthe facing strip rather than to the crests'of the ribs of the corrugatedweb. The adhesive may be applied all over a surface of the facing strip,or otherwise, and preferably in many cases, it is applied in the form oftransverse stripes or bands corresponding to the location of ribcrestsof the corrugated web when the two webs come in contact. In this way theadvantage of applying the adhesive to the facing strip instead of thecorrugated web is obtained, and at the same time the waste of adhesiveinvolved in all-over coating of the facing strip is avoided, in any casewhere it is not necessary or desirable to completely coat the facingstrip'.

The invention further provides for winding the completed web, either offaced or unfaced corrugated material` by traction applied to theperiphery of the roll, rather than by driving the roll from its centeror the l shaft upon which it is being formed.

The characteristics and advantages of the invention are furthersuiiiciently explained in connection with the following detaildescription of the accompanying drawings, which show one exemplifyingmechanism embodyler ing the invention and also sufliciently explain oneperformance of the process. After considering this example, personsskilled in the art will understand that many variations may be madewithin the principles of the invention, and I contemplate the employmentof any structures and methods that 'are properly within the scope of theappended claims. i

Figure 1 is a vertical, longitudinal section of essential parts ofmechanism embodying the invention in one form. v

Figure 2 is a top plan of the same, with certain parts omitted or brokenaway for the sake of clearness.

The frame of the machine is represented in4 somewhat diagrammaticfashion, for the sake of illustrative clearness. It includes side framemembers 1, 1a etc., which may be connected by any suitable transversemembers. A plurality of corrugating l'ollsare rotatively supported inframe uprights 1f. The number' of rolls may vary, and a large number ofrolls may be employed when' desired, because of the nature of theweb-guiding devices employed. ln the present instance, there are fourmain corrugating rolls 2, 3, 4 and 5, and preferably a primarycorrugating roll 6 is provided to cooperate with the first main roll 2.All of the rolls have longitudinal ribs 7, the ribs of adjacent rollsbeing arranged to interlit, and being formed in cross section to producethe desired rib formation in the corrugated web. Primary roll 6issupported by a shafttl which runs in suitable bearings in the frame,and rolls 2, 3, 4, and 5 are desirably hollow, and supported on tubularshafts 9 for the convenient supply of gas for heating the roll surfacesby combustion in the chambers 10 formed between the hollow shafts andtheroll shells. The rolls are usually positively driven by suitable gearconnections, such as gears 200. 201.

To secure a longer course of web travel in contact-with the rolls, theroll axes are desirably offset alternately, as clearly shown inFigure 1. The roll axes are thus arranged in two parallel verticalplanesl but evidently the rolls may be arranged in different positionsor relations.

To properly guide and retain a web in its course between and around therolls, suitable guide bands or belts are provided, and while the natureof these belts may vary considerably, in a preferred case, as shown,the)1 are in the form of sprocket cha-ins, which have ample flexibilitywith relative non-elasticity or freedom from stretching, and are welladapted to positively guide and hold the web in the desired fashion. Oneor more, usually a plurality of such chains 12 are arranged to engageand direct one side of the web and one or more, usually a plurality ofsimilar chains 13 are provided to of the chains 12 and three of thechains 13,

the chains at opposite sides of the web being evenly mtcrspaced. Chainsl2 run over sprockets 14 on a shaft 15, which may be l positivelydriven. From sprockets 14 the chains pass about the crests of the ribson roll 6 to a point where these ribs cooperate with the ribs of roll 2.The chains then enter annular channels 16 in roll 2, the depth of thesechannels being such that the outer surfaces ofk the chains aresubstantially flush .with the bottoms of the ribgrooves of the roll.Thechains then pass around the crests of the ribs ofroll 3 and throughgrooves 17 in roll 4, which are arranged in the same fashion as grooves16 previously mentioned, and then the chains pass around the crests ofthe ribs of roll 5 and aboutvidler sprockets 18 on a shaft 19, and fromthat point upward and over idler sprockets 2C on a shaft 21 and thenagain around sprockets 14, and so on.

Desirably, a belt 35, which may be the full width vof the web, (or elsea plurality of spaced narrower belts), of any suitable material, such ascanvas, is arranged with its upper stretch 36 parallel to the straightchain stretches 30 and spaced therefrom a f distance equal to thethickness of the corrugated web'. This belt or belts as the case may be,pass over forward and rear pulleys 37 and 38 on shafts 39 and 40 and maybe suitably tensioned by any suitable device, such as pulleys 41 andintermediate adjustable pulley 42.

Sprockets 18 are arranged as close as convenient to forward pulleys 37,to bring the adjacent portions of the guide chains 12 as close aspossible to the upper stretch of the belt where it comes under roll 5.Since a slight gap 'is practically unavoidable at this point, fixedguide fingers or blades 45 are provided, which may be supported on shaft19 and which are contoured to it close to the peripheries of the ribs ofroll 5, and these guide fingers preferably are tapered off nearly to apoint, so that they directv and hold the corrugated web in contact withthe ribs of roll I5 almost up to the point where the upper stretch 36 ofthe'belt strikes the web and holds itas it moves onward.

A roll of paper or cardboard suitable for corrugating is supported bymeans of a shaft 5l which may rest in any suitable lfiearings on anupward part of the frame (not shown), and a web 52 is drawn from theroll and conducted in any suitable way to the initial corrugatingroll;for instance, as shown` the web maybe drawn over a guide roll onshaft 54. The end of the web is then inserted between chains 12 and roll6, and is carried around and held b v the chains in firm contact withthe crests of the roll corrugations. The advancing end of the web thenencounters the corrugations T ou roll 2 and as the web advances betweenthe. rolls 6 and 2 it is properly pressed iu ribbed forms by theinterfitting corrugations, and as soon as each portionof the web passesthe corrugating point the web is stripped away from roll 6 by chains 13,which emerge from the channels of roll 6 and pass about the periphery ofroll 2 suing the latter firmly in contact with the corrugations of roll2 throughout the larger part of its periphery. The web is then subjectedto further corrugating pressure by the interfitting ribs of rolls 2 and3, and is stripped away from roll 2 by chains 12 and is by them heldproperly upon roll 3, is again pressed Vbetween rolls 3 and 4 andstripped from roll 3 by chains 13 and guided about the periphery of roll4, again pressed between rolls 4 and 5, stripped from roll 4 by chains12 and guided about almost onehalf the circumference of roll 5 by chains12, and is then guided `a short distance beyond the point where chains12 are carried away from the roll, by the fixed guide fingers 45. Thecorrugated web is again engaged before it passes away from roll 5 by theupper stretch of belt 36, which, with chains 12 and guide fingers 45,serves to maintain the web in proper engagement with the corrugations ofroll throughout more than one-half of the roll circumference.

The web then proceeds away from roll 5, being stripped from the roll bychains 13. and is held between 'chain stretches 30 and the upper stretch36 of belt 35 with sufficient firmness to prevent any, or anyappreciable, elongation or loss of form of the corrugations.

It is thus evident that the described arrangement of parts and method ofhandling the web provides not only for conveying the web through a longcourse of travel past several points of corrugating pressure and inContact throughout its course with corrugating ribs, so thatcorrugations are properly formed and set practically permanently in thedesired shape, and also, when desired, with ample heat treatment fromthe hot surfaces of the successive rolls, but the web is 'easilythreaded through the rolls by action of the rolls and guides themselveswithout` any annoyance or delay, the web feeding or guiding devicesbeing all traveling devices which infalliblv carry the advance edge ofthe web through the proper course when the edge is properly introducedbetween chains 12 and roll 6 without particular care or attention of theoperator. The only fixed guide devices in the mechanism as so fardescribed are the stationary blades 45, but these are arranged in thedirection of web movement and offer no perposed upon the corrugated weband holdto passage of the web,

possible interference or 1n proper corrugated form. For this purpose v aroll 60 of suitable facing paper is rotatably supported on a shaft 61which rests in bearing sockets 62 on the frame, as sufficiently shown inFigure 2, The facing web 63 is drawn from the roll and is conducted overthe upper stretch of belt and under the guide blades and into contactwith a face of the corrugated web while the latter is still on roll 5and firmly held thereon by belt 35, which in this case also serv-es tobring the facing strip in rm contact with the corrugated web, and tomaintain it in such Contact in the further travel of the webs betweenbelt stretch 36 and chain stretches 30.

In producing faced corrugated board, it has been customary to applyadhesive to the crests of the corrugations-and thenbring the facingstrip in contact with these glued corrugations; or, in some cases, thefacing web has been coated all over before applying it to the corrugatedweb. rlhe present invention provides improved means for applying theadhesive to the facing web, and also provides as a preferred arrangementfor applying the adhesive thereto only in transverse strips or stripescorresponding to the subsequent location of crests on the ribs of thecorrugated web when the latter is brought in contact with the vfacingweb. For this purpose suitable adhesive-applying mechanism is providedat a point intermediate roll and corrugating roll 5, consisting in thepresent example. of the following: A glue-applying roll 65 carried by ashaft 65a in suitable bearings', is provided with spaced longitudinalribs 66, the spacing of these ribs corresponding to the crests of theribs of the corrugated web. Glue is applied in any known or suitable wayto the crests of ribs 66, and roll 65 is rotated, usually by positivedriving means, in contact with web 63, which may be directed to the glueapplying roll by guide rolls 67 and 63. The speed of travel of web 63is. of course, equal to that of the completed corrugated web, since itis drawn along with the corrugated web by any suitable means(sufliciently described hereafter) and the corrugated periphery of roll65 is driven at the same surface speed, which is also the surface speedof corrugatin'g roll 5. Roll 65 is adjusted so that the glue stripesthus imprinted on web 63 are posi- `driven faster than the other.

tioned in accordance with the positions of downwardly presented crestsof the ribs on the corrugated web at the pointof web-contact; andthereafter the relative position of roll 65 is maintained and the gluestripes are properly imprinted on the facing web which therefore adheresto the crest of every corrugation on the corrugated web 52.

Preferably improved means are provided for supplying glue to the crestsof' ribs 66, consisting in the present instance of the following:CooperatingA glue-supply rolls 7() and 71 are provided, the surface ofone of these rolls being of suitable elastic or compressible material,such as rubber or rubber composition, and preferably the surfaces ofboth of the rolls are composed of such material. The rolls are mountedin bearings in frame brackets 210. Desirably the rolls are broughttogether with yielding pressure, and for this purpose one of the rolls71 is mounted on bearings on arms 215 pivoted at 216, and springs 217act on the upper ends of the arms to urge the roll yieldingly againstroll 70. Desirably, rolls 7() and 71 are so driven that engaging facestravel downward, and while they may be driven at the same speed,preferably one is Shaft 78 of roll 70 may be the primary driving memberof th-e glue mechanism. A pinion 220 on shaft 7 8 engages a gear 221 onthe shaft of roll 71, and gear 221 in this instance is made larger thangear 220 so that roll 71 travels slower than roll 70. With the describeddrive arrangement for the glue supply rolls, the glue applying roll 65is conveniently driven from shaft 7 8 by gear 225 engaging a gear 226 onthe glue lroll shaft 65a. This shaft is mounted in bearings in arms 230pivot-ed at 231, and springs 232 act on the upper ends of the arms tohold the ribs of roll yieldingly against the surface `of .glue supplyroll 7 O.- The teeth of the gears are so designed as to permit. theslight degree of relative movement of the rolls.

The adjacent faces of the glue-supply rolls and 71 above their line ofcontact provide in effect a trough to which suitable adhesive is appliedin any suitable way, for instance, by a pipe 75, which runs along abovethe `trough and has suitable apertures 76 to supply small streamsofvglue at interlvals to form a long pool or body 77 of glue lying inthe trough between the roll surfaces. Glue may be supplied to pipe atone end by an upright pipe 80 leading from the glue tank 81 in whichglue may be kept in proper condition in any known or suitable way; andthe flow of glue may be controlled by any suitable valve 82.

The rotation of the supply rolls 70 and 7l in contact with the gluepuddle in the trough formed by the roll surfaces, keeps Y the glue inproper condition and evenly distributes it over the surfacev of roll70'in proper quantity or thickness; and the proper distribution andregulation of the thickness of the film of glue on roll 7() is furtherfacilitated by the difference in roll speeds, which produces a rubbingcontact of the roll surfaces. Glue is taken from the surface of roll y70by the ribs of roll 65 and applied in transverse stripes to the facingweb 63. A'ny excess ofglue in puddle 77 runs. off at the ends of therolls and is caught by any suitable trough (not shown) In some cases aglue applying roll having a smooth cylindrical periphery may besubstituted for roll 65, rand in that case, glue will be supplied allover the surface of facmg web 63.

'lhe combined web, consisting of the corrugated web and the facing webadhesively secured to it, may be carried any suitable distance betweenbelt stretch 36 and chain stretches 30, to insure properadhesion `of thewebs by hardening or setting of the glue, or additonal conveying devicesmay be provided to conduct the combined web and retain its parts inContact to a desired point of delivery or utilization.

In many cases it is desired to wind the faced web in roll form, and anysuitable winding mechanism may be provided. Difficulty has, however,been experienced in the ordinary rolling or Winding mechanism employedfor this purpose, ign-which the roll has usually been driven from itscenter or shaft, involving various difliculties, such as a variation indriving speed, due to the variation in roll diameter and therefore inits peripheral speed. To do away with these difficulties and to providean improved and simplev windiner mechanism, I provide frame uprights orrackets 90 having slots or channels 91 to accommodate the ends 0r endportions of a roll shaft 92. This shaft serves sfmply as a center orcore for the roll, and a guide to position it longitudinally of themachine. The faced web is conducted to shaft 92 and its end is turnedabout the shaft to start the roll formation, and the roll is thenallowed to rest on any suitable l therefore actually rests upon thebelt, which is supported by the drum or pulley. The tractive effect ofthe belt orv pulle therefore rotates the roll in the proper irection atthe same surface speed as that of the completed web, and as the rolldiameter increases, shaft 92 moves up in its guides 91 until the desiredmaximum roll diameter, indicated by dot-and-dash lines 95, is reached,and then the roll is removed, another shaft is inserted, and so on. Bythis Vsimple arrangement no attention need be paid to variation in thespeed of drive, since this is automatically taken care of by 252 from acountershaft.

the fact that the periphery of the roll is always driven at the samespeed, and this is the speed at which the web is supplied to the roll.

For various reasons, andy especially because the varying diameter of theroll requires its shaft 92 to be located considerably away from thecorrugated rolls or from the ascending stretches of chains 13,web-controlling or retaining and conveying devices, in addition tochains 13, are usually supplied in connection with belt 35. For example,in the present embodiment of the invention, a belt 100 is provided,passing about pulleys 101 on sprocket shaft 32 and about other pulleys102'on a shaft 103. The lower stretch of belt 100 comes in contact withthe upper face of the corrugated web before chains 13 leave the web, andthe corrugated formation is therefore properly maintained and thecorrugated web is held in proper contact `with the facing web, to apoint close to roll 95. Since belt pulleys 102 must be located somedistance away from tlie shaft guides 91, guide bars or blades 110 aredesirably provided to rest on the upper surface of the corrugated web`from a point where the web leaves contact with belt 100 up to a pointvery close to the lower surface of roll 95. These bars may be pivotallysupported on pulley shaft 103, andtheir rear ends are tapered offapproximately to points to bring them as close as possible to the rollof completed material, 95. The blades or guide members 110 may be madeof substantial weight to exert iiexible pressure on the upper surface ofthe corrugated web and maintain it in proper contact with the upperstretch of belt 35 substantially up to the .point where the completedweb passes on to roll 95.

The different moving parts, or groups of parts, may be driven in variousways. 1t will be sufficient to briefly. describe one representativedrive arrangement.

A main drive shaft 250 may be driven in any convenient way, forinstance, by an electric motor or by a pulley 251 and belt Shaft 39 offorward belt pulley 37 is driven by a chain 253 from sprockets ofsuitable diameter from main shaft 250. A pinion near one end of shaft250 engages a gear 260 of suitable diameter on the shaft of the lowercorrugating roll 5, and the other corrugating rolls are driven from thelower roll shaft by suitable gear connections such as the gear 200 and201, previously mentioned.

Chains 12 may be driven by the sprockets onshaft 15, which is connectedby a pinion 265 to a gear 266 on shaft 8 of vprimary corrugatingr roll6. `Chains 13 may be driven by the sprockets on shaft 26 which isconnected byl a chain 270 and sprockets to shaft 8. T e primary drivingmember,

surfaces of the roll and move therewith and to retain an interposedsheet of material on the roll, and at least one other band beingarranged to travel with the roll and to lie thereon substantially belowthe level of the corrugations and to strip the web from the roll.

2. Mechanism for corrugating sheet material, comprising a plurality ofrolls having corrugated surfaces, and a flexible web guiding andretaining band, arranged to move with the rolls and to overlie thecorrugated surface of one roll and retain an interposed web of materialto be corrugated on the roll and to lie upon another roll substantiallybelow7 the level of the corrugatiolns thereon and to strip the web fromthe ro l.

3. Mechanism for corrugating sheet material, comprising a roll having a.corrugated surface, and flexible web guiding and retaining bands, atleast one of the bands` being arranged to overlie the corrugated surfaceof the roll and move therewith at the same surface speed and to retainan interposed web of material on the roll, and at least one other bandbeing arranged to underlie the web in a depressed portion of the rollsubstantially below the level o'f the corrugations thereon and to stripthe web from the roll.

4. Mechanism for corrugating sheet material, comprising a roll having alongitudinally corrugated surface, and flexible web guiding andretaining chains, at least one of the chains being arranged to overl'.ethe corrugated surfaces of the roll and move therewith at the samesurface speed and to retain an interposed sheet of material on the roll,and at least one other chain being arranged to travel in an annular rollchannel substantially below the level of the corrugations and under thesheet and to strip the sheet from the roll.

5. Corrugating mechanism comprising a series of at least two corrugatingrolls h aving at least. one line of corrugating contact, and meanstraveling with the rolls at sub 'stantially the same surface speed forpositively directing a web of sheet material in contact with thecorrugations of successive rolls, and also moving between the rolls atthe line. of contact and stripping the web from one roll and applying itto the next.

6. Corrugat-ing mechanism comprising a series of at least twocorrugating rolls having at least one line of corrugating contact, andmeans traveling with the rolls at substantially the same surface speedfor positively directing a web of sheet material in Contact with thecorrugations of successive rolls, and also moving between the rolls atthe line of contact, stripping the web from one roll and applying it tothe next, and traveling means engaging the web and maintaining itscorrugated formation as .it moves away from the last corrugating roll.

7. Corrugatlng mechanism comprisin a series of corrugating rolls havinga p urality of lines of corrugating contact, and traveling means forpositivelyv directing a web of sheet material about largecircumferential portions of successive rolls, and between the rolls atthe successive Contact lines, retaining the web in contact withI thesuccessive corrugating surfaces, and strlpping the web from one roll andapplying it `to the next at 'each roll contact line.

8. Corrugating mechanisnrcolnpiising a series of corrugating rollshaving a plurality of lines of corrugating Contact, anfl traveling meansfor positively directing a web of sheet material about largecircumferential portions of successive rolls, and between the rolls atthe successive Contact lines, retaining the web in contact with thesuccessive corrugating surfaces, stripping the web from one roll andapplying it to the next at each roll contact line, and traveling meansengaging opposite faces of the web and maintaining its corrugatedformation as it moves away from the last corrugating roll.

9. Corrugating mechanism comprising a series of rolls having corrugatedsurfaces in approximate contact at a plurality of points, and flexible'traveling bands arranged to guide and retain a web of ma.- terial to becorrugated in contact with the corrugated roll surfaces and to strip theweb from one roll and apply it to the next succeeding roll substantiallyat the point of roll contact.`

l0. Corrugating mechanism' comprising a series of rolls havingcorrugated surfaces in approximate contact at a plurality of points andflexible traveling endless chains arranged to guide and retain a web ofmaterial to be corrugated in contact with the corrugated roll surfacesand to strip the web from one roll and apply it to the next succeedingroll substantially at the point of roll contact.

11. Corrugating mechanism comprising a series of corrugating rolls, eachroll in the series having its corrugations intertting those of at leastone adjacent roll, and means for definitely guiding and retaining a web0f material to-be corrugated over large circumferential portions of thesuccessive rolls, said means comprising flexible bands arranged atopposite surfaces of the web and driven at roll surface speed aroundcircumferential portions of the successive rolls and between the rollsat the points of approximate roll contact.

1 2. Corrugating mechanism comprising a series of corrugating rolls,each roll in the series having its corru'gations interlitting those ofat least one adjacent roll, and means for deinitelyiguiding andretaining a web of material to be corrugated over` large circumferentialportions ofthe successive rolls, said means comprising flexible bandsarranged at opposite surfaces of the web and driven at roll surfacespeed around circumferential portions of the successive rolls andbetween the rolls at the points of approximate roll contact, one of thebands as itpasses about each roll being accommodated in an annulerchannel in the roll substantially below the level of the rollcorrugations, and another band at the opposite surface of the webpassing about the crests of the roll corrugations toretain theinterposed web thereon.

13. Corrugating mechanism comprising a series of corrugating rolls, eachroll in the series having its corrugations interfitting those of atleastone adjacent rol and means for definitely guiding and retalning a web ofmaterial to be corrugated over large circumferential portions of thesuccessive rolls, said means comprising flexible bands arranged atopposite surfaces of the web and driven at roll surface speed aroundcircumferential portions of the successive rolls and between the rollsat the points of approximate roll contact, one of the bands as it passesabout each roll being accommodated in an annular channel in the rollsubstantially below the level of the roll corrugations, and another bandat the opposite surface of the web passing about the crests of the rollcorrugations to retain the interposed web thereon, the band located inthe channel of one roll being arranged to pass about the crests of thecorrugations ofthe next successive roll` and to strip the corrugated webfrom the one roll and apply it to the next.

14. Corrugating mechanism comprising a series of corrugating rolls, each4roll in the series having its corrugations interfitting those of atleast one adjacentroll, and means for definitely guiding and retaining aweb of material to be corrugated over large circumferential portions ofthe successive rolls, said means comprising iexible .endless chainsarranged at opposite surfaces of the web and driven at roll surfacespeed around circumferential portions of the successive rolls andbetween the rolls at the points of approximate roll contact.

15. Corrugating mechanism comprising a lseries of corrugating rolls,each roll in the series having its corrugations interfitting those of atleast one adjacent roll, and means for definitely guiding and retaininga web of material to be corrugated over large circumferential portionsof the successive rolls, said means comprising iexible endless chainsarranged at opposite surfaces of the web and driven at roll surfacespeed around circumferential portions of the successive rolls andbetween the rolls at the points of approximate roll contact, one of thechains as it passes about each roll being accommodated in annularchannel in the roll substantially below the level of the rollcorrugations, and another chain at the opposite surface of the webpassing about the crests of the roll corrugations to retain theinterposed web there- 16. Corrugating mechanism comprisinga series ofcorrugating rolls, each roll in the series having its corrugationsinterfitting those of at least one adjacent roll, and means fordefinitely guiding and retaining a web of material to be corrugated overlarge circumferential portions of the successive rolls,

- said means comprising iiexible endless chains arranged at oppositesurfaces of the web and driven at roll surface speed aroundcircumferential portions of the successive rolls and between the rollsat the points of approximate roll contact, one of the chains as itpasses about each roll being accommodated in annular channel in the rollsubstantially below the level of the roll corrugations, and anotherchain at the opposite surface of the web passing about the crests of theroll corrugations to retain the interposed web thereon, the chainlocated in the channel of one roll being arranged to pass about thecrests of the corrugationsof the next successive roll and to strip thecorrugated web from one roll and apply it to the next.

17. Corrugating mechanism comprising a series of rolls having corrugatedsurfaces, the surface of each roll approximately interfitting those -ofthe next roll in the series along a pressing line parallel to the rollaxes, and a plurality of iiexible web retaining, guiding and strippingbands arranged to carry a web of sheet material to be corrugated in acircuitous course over and between the rolls, the bands being arrangedto move substantially at roll-surface speed, each band being arranged toalternately underlie the web as it passes about one roll and to retainthe web on the corrugations of the next roll in the series, and to stripthe web from one roll and apply it to the next one.

18. Corrugating mechanism comprising a series of rolls havinglongitudinal surface corrugations and having their axes alternatelyoffset, the corrugations of each roll substantially interitting those ofat least one adjacent roll, and continuous, traveling flexible webguiding bands arranged at opposite sides of a web of sheet material tobe corrugated, and passing about major portions of the lsuccessive rollcircumferences and between adjacent rolls at each point of approximateroll contact, the rolls being provided with annular channels, each bandpassing alternately through one of the roll channels and then about thecrests of the corrugations of the next roll to hold 'the interposed webthereon.

19. Corrugating mechanism comprising a series of main corrugating rollshaving substantially interfittingcorrugations, a primary corrugatingroll, and traveling bands arranged at opposite surfaces of a web ofsheet material to be corrugated, one of the bands being arranged tounderlie the web as it passes about a circumferential portion of theprimary roll and another band being arranged to ovcrlie the web andretain it upon the crests of the corrugations as it passes about a largecircumferential portion of the primary roll.

20. Corrugating mechanism comprising a series of main corrugating rollshaving substantially interfitting corrugations, a primary corrugatingroll, and traveling bands arranged at opposite surfaces of a web ofsheet material to be corrugated, one of the bands being arranged tounderlie the web as it passes about a circumferential portion of theprimary roll and another band being arranged to overlie the web andretain it upon the crests of the corrugations as it passes about acircumferential portion of the primary roll, the bands being arranged tothen direct and retain the web in contact with the successive main-rollcorrugations, and to strip the web from each roll and apply it to thesucceeding one.

21. Corrugating mechanism comprising a series of corrugating rolls,traveling bands arranged to direct and retain a web of material to becorrugated in contact with successive roll surfaces, and traveling webengaging and directing members arranged to retain the web in corrugatedformation as it moves away from the last roll in the series.

22. Corrugating mechanism comprising a series of corrugating rolls,traveling bands arranged to direct and retain a web of material to becorrugated in contact with successive roll surfaces, the bands engagingone web surface being directed in contact with the corrugated web afterit leaves the last roll in the series, a traveling web-engaging anddirecting member arranged to retain the web in Contact with the lastnamed bands as they move away from the last roll, and web-guiding andretaining blades arranged to retain the web in contact with a portion ofthe surface of the last corrugating roll after the web is free fromcertain of the proper form.

24. Corrugating 'mechanism comprising a series of corrugating rolls, asystem of traveling web guiding and retaining bands arrangedsubstantially at opposite sides of the roll series, certain of the bandshaving a course of travel away from the last roll in the series, and atraveling belt arranged to retain the corrugated web in Contact with thelast named bands in the stated course of travel, and retain thecorrugatons in proper fo and fixed guide fingers Aretaining the wel!)nin contact with a portion of the last roll surface and directing it tosaid belt.

25. Corrugating mechanism comprising a series of corrugating rolls,traveling means for directing and retaining a web of material in contactwith successive roll surfaces, .means for applying a web of facingmaterial to the corrugated web while it is definitely retained in propercorrugated formation, and means for supplying adhesive prior to webcontact to connect the webs.

26. Corrugating mechanism comprising a series of` corrugating rolls,traveling means for directing and retaining a web of mate-rial incontact with successive roll surfaces, means for applying a web offacing material to the corrugated web while it is definitely retained inproper corrugated formation and means for supplying adhesive prior to-web contact to connect the webs and traveling means for retaining thewebs 1n contact and maintaining the corrugations of the corrugated webin proper form during a substantial length of movement.

27. Corrugating mechanism comprising a Vseries of corriigating rolls,traveling means arranged to direct and retain a web of material to becorrugated in Contact with successive roll surfaces, means for directinga web of a facing material and applying it to the corrugated web whilethe latter' is retained iii proper corrugated form, and means forapplying adhesive to secure the webs together prior to web contact.

28. Corrugating mechanism comprising a series of corrugating rolls,traveling means arranged to direct and retain a web of material to becorrugated in contact with sucf cessive roll surfaces, means` forapplying transverse stripes of glue to a surface of a facing web `1npositions correspondmg to subsequent points of contact with ribs of thecorrugated web, and means for directing and applying the facing web tothe corrugated .web whilethe latter is retained in proper corrugatedforni.

29.`Corrugating mechanism comprising means for corrugating a web ofsheet material, means for bringing a web of facing material in contactwith the corrugated web while the ribs of the latter are retained inform, a glue roll having longitudinal ribs corresponding to the spacingof the ribs of the -corrugated web, means for supplying glue to the glueroll ribs, andmeans for driving the glue roll in contact with a surfaceof facing web to apply transverse glue stripesy to the web in spacedrelation corresponding to subsequent contact points with the ribs of thecorrugated web.

30. Corrugatingl mechanism comprising means for corrugating a web ofsheet material, means for bringing a web of facing material in contactwith the corrugated web, a glue roll iii contact with a surface ofthefacing web, a pair of glue Asupply rolls, one

. of which is arranged to supply glue to the glue roll, the glue supplyrol s having engaging surfaces, and means for supplying glue to thetrough formed bysaid engaging roll surfaces.

31. Corrugating mechanism comprising means for corrugating a web ofsheet material, means for bringing a web of facing material in Contactwith the corrugated web, a glue roll in contact with a surface of thefacing web, a pair of glue supply rolls, one of'wliicli is arranged tosupply glue to the glue roll, the .glue supply rolls having engagingsurfaces, means for supplying glue to the trough formed by said engagingroll surfaces, and means for driving the glue supply rolls so that theirengaging faces move downward. u

32. Corrugating mechanism comprising means for corrugating a web ofysheet material, means for bringing a web of facing` material in contactwith the corrugated web, a glue roll in contact with a surface of thefacing web, a pair of glue supply rolls, one of which is' arranged tosupply glue to the glue roll, the glue supply rolls having engagingsurfaces, means for supplying glue to the trough formed by said engagingroll surfaces, and meansv for driving the glue Supply rolls at differentperipheral speeds to produce a rubbing contact.

33. Corrugating mechanism comprising means for corrugating a web ofsheet material, means for bringing a web of facing material in contactwith the corrugated web While the ribs of the latter are retained inform, a, glue roll in contact with a surface of the facing web, a pairof glue supply rolls, one of which is arranged to supply glue'to theglueroll, the glue supply rolls having engaging surfaces, and means forsupplying glue to the trough Aformed above said engaging roll surfaces.

34. Corrugating mechanism comprising means for corrugating a web ofsheet material, means for bringing a web of facing material in contactwith the corrugated Web while the ribs of the latter are retained inform, a glue roll in Contact with a surface of the facing web, a pair ofglue supply rolls, one of which isy arranged to supply glue to the glueroll, the glue supply rolls having engaging surfaces, and means forsupplying glue to the trough formed above said .engaging roll surfaces,and'means for driving the glue supply rolls at different peripheralspeeds to produce a rubbing contact.

35. Corrugating mechanism comprising means for producing transversecorrugations on a web of sheet material, means for applying a Web offacing material tothe corrugated web While the latter is retained incorrugated formation, means for supplying adhesive prior to web contactto secure the Webs, and means for conveying the com# bined Webs awayfrom the corrugating means and retaining the corrugations in proper formduring such travel.

36. Corrugating mechanism comprising means for producing transversecorrugations on a web of sheet material, means for Winding the`corrugated web in roll form, and means for retaining the corrugationsin proper shape substantially up to the point of Winding.

37. Corrugating mechanism comprising means for producing transversecorruga tions on a web of sheet material, a Winding center for thecompleted Web of corrugated material on which the web is Wound in rollform, and means for driving the roll of completed material by surfacetraction.

38. Corrugating mechanism comprising means for producing transversecorrugations on a Webof sheetl material, `a Winding center forthe'completed web of corrugated material on which the web is Wound inroll form, means for driving the roll of conipleted material by surfacetraction, and means for guiding the roll center and retaining tlie rollin proper relation to the driving means as its diameter increases.

39. Corrugating mechanism comprising means for, producing transversecorrugations on a Web of sheet material, a moving friction elementarranged to support and drive a roll of the completed corrugatedinaterial, roll center guides, and a roll center arranged in the guidesand adapted to centrally direct a roll of completed material as it is'Wound upon the center and driven by traction from said frictionelement.

40. Corrugating mechanism comprising means for producing transversecorrugations on a Web of sheet material, a winding center for thecompleted web of corrugated material on which the web is wound in rollform, and means for driving the roll of completed material by surfacetraction, and traveling means for directing the Web and retaining itscorrugations in proper shape from the corrugating-means substantially tothe point Where it is Wound upon the roll.

41. Corrugating mechanism comprising -means for producing transversecorrugations on a Web of sheet material, a Winding center for thecompleted web of corrugated material on which the Web is wound in rollform, and means for driving the roll of.

ing adhesive prior to web Contact to secure' the Webs, and means forWinding the faced web in roll form While the corrugations are retainedin proper shape.

43. Corrugating mechanism comprising means for producing transversecorrugations on a Web of sheet material, means for applying a web offacing material to the corrugated web While the latter is retained incorrugated formation, a Winding center for the faced Web of corrugatedmaterial, on which the web is Wound in roll form, and means for drivingthe roll of completed material by surface traction applied to the facingweb at the roll periphery.

44. `Corrugating mechanism comprising means for producing transversecorrugations on a web of sheet material, means for applying a web offacing material to the corrugated Web While the latter is retained incorrugated formation, a Winding center `'for the faced web of corrugatedmaterial, on

which the web is Wound in roll form.' and means for driving the roll ofcompletedy material by surface traction, and means for guiding the iollcenter and retaining the roll in the proper relation to the drivingmeans as its diameter increases.

45. Corrugating mechanism comprising means for producing transversecorrugations on a web of sheet material, ineans'for applying aI webK offacing material to the corrugated web While the latter is retained incorrugated formation, means for supplying adhesive prior to Web contactto secure the Webs, means for conveying the combined webs away from, thecorrugating means and retaining the corrugations in proper form duringsuch travel, a, rotary friction element arran ed to support and drive aroll of completedg material, roll center guides, land a roll centerarrangement in the guides and adapted to centrally direct a roll ofcompleted material as it is wound upon the center and driven by tractionfrom said friction element.

46. Corrugating mechanism comprising means for producing transversecorrugations on a web of sheet material, means for applying a. web offacing material to the corrugated web While the latter is retained incorrugated formation, means for supplying adhesive prior to web contactto secure the Webs, means for conveyingr the combined webs away from thecorrugating means and retaining the corrugations in proper form duringsuch travel, a rotary friction element arranged to support and drive aroll of completed material, roll center guides, and a roll centerarrangement in the guides and adapted to centrally direct a roll ofcompleted material as it is Wound upon the center and driven by tractionfrom said friction element, and traveling means for directing the weband retaining its corrugations in proper shape from the corrugatmg meanssubstantially to the point Where it is Wound upon the roll.

l?. Corrugating mechanism comprising means for producing transversecorrugations on a Web of sheet material, means for applying a web offacing material to the corrugated Web While the la-tter is retained incorrugated formation, means for supplying adhesive prior to Web Contactto secure the Webs, means for conveying the combined webs away from thecorrugating means and retaining the corrugations in proper form duringsuch travel, a rotary friction element arranged to support and drive aroll of completed material, roll center guides, and a roll centerarrangement in the guides and adapted to centrally direct a roll ofcompleted material as it is Wound upon the center and driven by tractionfrom said friction element, a traveling conveyor engaging and directingthe web to a point adjacent to the roll of completed material, and guidebars engaging a surface of the Web and directing the latter from saidconveyor to substantially the point of contact with the roll ofcompleted material.

48. Corrugating mechanism comprising a series of corrugating rolls,traveling bands arranged to direct a web of sheet material to becorrugated over large circumferential portions of the successive rolls,to retain the corrugated web positively in connection with the rollcorrugations and to strip the web' from each roll and apply it to thenext,

one, means for advancing and applying a sheet of facing material to thecorrugated web while the latter is in .contact with the last corrugatingroll, means for supplying adhesive to connect the Webs prior to webcontact, a continuous conveyor belt engaging a face of the completed webfrom a point adjacent to the last corrugating roll to a point ofdelivery, and traveling means engaging the opposite face of thecompleted web and holding it in contact with said belt and retaining thecorrugations in the proper form u to said delivery point.

49. orrugating mechanism comprising a series of corrugating rolls,traveling bands arranged to direct a Web of sheet material to becorrugated over large circumferential portions of the successive rolls,to retain the corrugated Web positively in connection with the rollcorrugations and to strip the web from each roll and apply it to thenext one, means for advancing and applying a sheet of facing material tothe corrugated web While the latter is in Contact with the lastcorrugating roll. means for supplying adhesive to connect the Webs priorto Web -contact, a continuous conveyor belt engaging a face of thecompleted web from a point adjacent to the last corrugating -roll to awinding position, traveling means engaging the other surface of the weband retaining it in contact With the conveyor substantially to saidWinding position, a pulley about which said conveyor belt pases at s'aidwinding position, roll center guides extending away from the pulley, anda roll center movably mounted in the guides and adapted to direct thecenter of a roll of conipleted material as it rests upon said pulley andis driven byl surface traction to Wind the completed material in rollform.

50. A method of producing corrugated sheet material, comprising passinga web of sheet material through a circuitous course in contact With aplurality of corrugating surfaces and subjecting thewveb to repeatedcorrugating pressures, and positively guiding and directing the webthroughout its course andu retaining the formed corrugations in propershape.

5l. A method of producing corrugated i sheet material, comprisingpassing a Web of sheet material through a circuitous course in contactwith a plurality of corrugating surfaces and subjecting the Web torepeated corrugating pressures, and positively guiding and directing theWeb throughout its course and retaining the formed corrugations inproper shape to a delivery point distant from the corrugating surfaces.

52. A method of producing the corrugated sheet material comprisingpassing a web of sheet material through a circuitous course in contactWith a plurality of corrugating surfaces and subjecting the web torepeated corrugating pressures, and positively guiding -and directingthe web lun throughout its course by web-engaging de.- vices whichtravel with the Web and retain theformed corrugations in proper shape.

53. A method of producing the corrugated sheet material comprisingpassing a web of sheet material through a circuitous course in contactwith a plurality of corrugating surfaces and subjecting the web torepeated corrugating pressures, and positively guiding and directing theweb throughout its course by Web-engaging devices which travel with theweb and retain the formed corrugations in proper` shape to a deliverypoint distant from the corrugating surfaces.

54. A method of producing faced corrugated sheet material comprisingpassing a sheet of material to be corrugated in contact With a pluralityof corrugating surfaces and subjecting the sheet to a plurality ofcorrugating nressures, and advancing. applying, and adhesively securinga web of facing material to the corrugated sheet while the latter isretained in proper corrugated form.

55. A method of producing faced crrugated sheet material comprisingpassing a sheet of material to be corrugated in contact with a pluralityof corrugating surfaces and subjecting the sheet to a pluralityofcorrugating pressures, and advancing, applying, and adhesivelysecuring a web of facing material to the corrugated sheet While thelatter is retained in proper corrugated form, and conveying the combinedmaterials a substantial distance awayfrom the point of web contact toa-delivery point and meantime retaining the ribs of the corrugated sheetin proper form.

56. A method of producing faced corrugated sheetv material comprisingpassing a sheet of material to be corrugated in contact with a pluralityof corrugating surfaces and subjecting the sheet to a plurality ofcorrugating pressures, advancing a Webl 0f facing materlal, applyingadhesive to a surface of said Web, and bringing the adhesivelyconditioned surface of said web in contact with a face of the corrugatedweb While Jghe latter is-retained in proper corrugated orm.

57. A method of producingfaced corru gated sheetmaterial comprisingpassing a sheet of material to be corrugated in contact With a pluralitylof corrugating surfaces and subjecting the sheet to a pluralit)T ofcorrugating pressures, advancing a web of facing material, applyingadhesive to a surface of said web, bringing the adhesively conditionedsurface of said web in contact With.

a face of the corrugated sheet while the latter is retained in' propercorrugated form, and conveying the combined materials a substantialdstance away from the point of contact 'and meantime retaining them incontact to assure' proper adhesive connectlonv 58. A method of producingfaced corrugated sheet material comprising passing a' sheet of materialto be corrugated .in contact with a plurality of corrugating surfacesand subjecting'the sheet to a plurality of corrugating pressures,advancing a web of facing material, ap lying adhesive to a surface ofsaid web, ringing the adhesively conditioned surface of said Web incontact with a face of the corrugated sheet While the latter is retainedin proper corrugated-form, conveying the combined materials asubstantial distance away from the point of contact and meantimeretaining the ribs of the corrugated sheet in proper form.

59. A method of producing faced corrugated sheet material comprisingpassing a sheet of material to be corrugated in contact with a luralityof. corrugating surfaces and subjecting the sheet to a pluralit ofcorrugating pressures, advancing a we of facing material, applyingspaced transverse strips of adhesive'to a surface of the facing web inpositions corresponding to the spacing of the ribs of the corrugatedweb, bringing the facing sheet in contact with the corrugated sheet withthe glue stripes in contact with crests of the corrugations, andadvancing the combined materialsA and retaining them in contact througha substantial course of travel.

60. A method of producing faced corru-` gated sheet material comprisingpassing a sheet of material to be corrugated in contactr.with aplurality of corrugating surfaces and subjecting the sheet to aplurality of corrugating pressures, advancing. a web lof facingmaterial, supplying spaced transverse stripes of adhesive to a surfaceof the facing web in positions corresponding to the spacing of the ribsof the corrugated sheet, bringing the facing web in contact with thecorrugated sheet While the latter is retained in proper corrugatedformation and with the glue stripes in contact -with crests of the corrugations, and advancing the combined materials and retaining them incontact and preserving the formation of the corrugations through asubstantial course of travel.

61. A method of producing faced corrugated sheet material comprisingpassing la sheet of material to be corrugated in contact with aplurality of corrugating surfaces and subjecting the sheet toa'plurality of corrugating pressures, and Winding the corrugated sheetin roll form by traction applied tothe roll periphery, the sheet beingkept under control to maintain the formed corrugations in propershape upto the point of Winding. p

62. A method of producing faced corrugated sheet material comprisingpassing a web of material 'to be corrugated in contact with a pluralityof corrugating surfaces and subjecting it to a plurality of corrugatingIco.

pressures, advancing, applying and adhesively securing a web of facingmaterial to the corrugated web While the latter is retained in propercorrugated form, and Winding the combined Webs in roll form by trac--tion applied to the facing web at the roll periphery, the combined Webbeing maintained in form up to the point of Winding.

63. A method of producing corrugated sheet material, comprising passinga Web of sheet material through a circuitous course in contact with aplurality of corresponding surfaces and subjecting the Web to repeatedcorrugating pressures, positively guiding and directing the webthroughout its course and retaining the formed corrugations in propershape to a delivery point distant from the corrugating surfaces, andWinding the corrugated' Web in roll form by traction applied to the rollperiphery.

64. A method of producing faced corrugated sheet material comprisingpassing a sheet of material to be corrugated in con tact with aplurality of corrugating surfaces and subjecting the sheet to aplurality of corrugating pressures, advancing, applying, and adhesivelysecuring a sheet of facing material to the corrugated 'web while thelat-ter is retained in proper corrugated form,

and conveying the combined materials a subi stantial distance away fromthe point of sheet Contact to a delivery point and meantime retainingthe ribs of the corrugated web in proper forni, and Winding the combinedmaterials in roll form by traction ap- I plied to the facing web at theroll periphery. Signed at Brooklyn. N. Y., in the county of Kings andState of New York, this 11th day of Sept., A. D., 1923.

HARRY BRIDGMAN SMITH.

